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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <title>Introduction</title>  <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="book.zlib.html">Zlib</a></div> <div class="next" style="text-align: right; float: right;"><a href="zlib.setup.html">Installing/Configuring</a></div> <div class="up"><a href="book.zlib.html">Zlib</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="intro.zlib" class="preface">  <h1 class="title">Introduction</h1>  <p class="para">   This module enables you to transparently read and write   gzip (.gz) compressed files, through versions of most of   the <a href="book.filesystem.html" class="link">filesystem</a> functions   which work with gzip-compressed files (and uncompressed files,   too, but not with sockets).  </p>  <blockquote><p><b class="note">Note</b>:        Version 4.0.4 introduced a fopen-wrapper for .gz-files, so that    you can use a special <var class="filename">zlib:</var> URL to access    compressed files transparently using the normal f*() file access    functions if you prefix the filename or path with    <var class="filename">zlib:</var> when calling <a href="function.fopen.html" class="function">fopen()</a>. This    feature requires a C runtime library that provides the    <i>fopencookie()</i> function. Up to now the GNU libc    seems to be the only library that provides this feature.   <br />       In PHP 4.3.0, <var class="filename">zlib:</var> has been changed to    <var class="filename">compress.zlib://</var> to prevent ambiguities with    filenames containing &#039;:&#039; characters. The    <i>fopencookie()</i> function is not longer required.    More information is available in the section about    <a href="wrappers.compression.html" class="xref">Compression Streams</a>.   <br />  </p></blockquote> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="book.zlib.html">Zlib</a></div> <div class="next" style="text-align: right; float: right;"><a href="zlib.setup.html">Installing/Configuring</a></div> <div class="up"><a href="book.zlib.html">Zlib</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>

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